docs: update documentation for v3.13.1 feature changes

- Document object-style fallback_models with per-model settings
- Add model-settings compatibility normalization docs
- Document file:// URI support for prompt and prompt_append
- Add deterministic core-agent order (Tab cycling) docs
- Update rename compatibility notes (legacy plugin warning)
- Document doctor legacy package name detection
- Add models.dev-backed capability cache documentation
- Update Hephaestus default to gpt-5.4 (medium)
- Correct MiniMax M2.7/M2.5 usage across all docs
- Update all agent/category provider chain tables
- Fix stale CLI install/doctor options to match source
- Add refresh-model-capabilities command to CLI reference

Co-authored-by: Sisyphus <sisyphus@oh-my-opencode>

assets/oh-my-opencode.schema.json

@@ -4423,6 +4423,11 @@
         },
         "model_fallback_title": {
           "type": "boolean"
+        },
+        "max_tools": {
+          "type": "integer",
+          "minimum": 1,
+          "maximum": 9007199254740991
         }
       },
       "additionalProperties": false